\[\sin \left(x + \varepsilon\right) - \sin x\]
Test:
NMSE example 3.3
Bits:
128 bits
Bits error versus x
Bits error versus eps
Time: 9.7 s
Input Error: 16.6
Output Error: 0.5
Log:
Profile: 🕒
\(\begin{cases} \frac{{\left(\sin x \cdot \cos \varepsilon\right)}^2 - {\left(\cos x \cdot \sin \varepsilon - \sin x\right)}^2}{(\left(\cos \varepsilon\right) * \left(\sin x\right) + \left(\sin x\right))_* - \sin \varepsilon \cdot \cos x} & \text{when } \varepsilon \le -1.9234536f-05 \\ \cos x \cdot \sin \varepsilon & \text{when } \varepsilon \le 4.8450306f-11 \\ \frac{{\left(\sin x \cdot \cos \varepsilon\right)}^2 - {\left(\cos x \cdot \sin \varepsilon - \sin x\right)}^2}{(\left(\cos \varepsilon\right) * \left(\sin x\right) + \left(\sin x\right))_* - \sin \varepsilon \cdot \cos x} & \text{otherwise} \end{cases}\)

    if eps < -1.9234536f-05 or 4.8450306f-11 < eps

    1. Started with
      \[\sin \left(x + \varepsilon\right) - \sin x\]
      13.9
    2. Using strategy rm
      13.9
    3. Applied sin-sum to get
      \[\color{red}{\sin \left(x + \varepsilon\right)} - \sin x \leadsto \color{blue}{\left(\sin x \cdot \cos \varepsilon + \cos x \cdot \sin \varepsilon\right)} - \sin x\]
      0.6
    4. Applied associate--l+ to get
      \[\color{red}{\left(\sin x \cdot \cos \varepsilon + \cos x \cdot \sin \varepsilon\right) - \sin x} \leadsto \color{blue}{\sin x \cdot \cos \varepsilon + \left(\cos x \cdot \sin \varepsilon - \sin x\right)}\]
      0.6
    5. Using strategy rm
      0.6
    6. Applied flip-+ to get
      \[\color{red}{\sin x \cdot \cos \varepsilon + \left(\cos x \cdot \sin \varepsilon - \sin x\right)} \leadsto \color{blue}{\frac{{\left(\sin x \cdot \cos \varepsilon\right)}^2 - {\left(\cos x \cdot \sin \varepsilon - \sin x\right)}^2}{\sin x \cdot \cos \varepsilon - \left(\cos x \cdot \sin \varepsilon - \sin x\right)}}\]
      0.6
    7. Applied simplify to get
      \[\frac{{\left(\sin x \cdot \cos \varepsilon\right)}^2 - {\left(\cos x \cdot \sin \varepsilon - \sin x\right)}^2}{\color{red}{\sin x \cdot \cos \varepsilon - \left(\cos x \cdot \sin \varepsilon - \sin x\right)}} \leadsto \frac{{\left(\sin x \cdot \cos \varepsilon\right)}^2 - {\left(\cos x \cdot \sin \varepsilon - \sin x\right)}^2}{\color{blue}{(\left(\cos \varepsilon\right) * \left(\sin x\right) + \left(\sin x\right))_* - \sin \varepsilon \cdot \cos x}}\]
      0.7

    if -1.9234536f-05 < eps < 4.8450306f-11

    1. Started with
      \[\sin \left(x + \varepsilon\right) - \sin x\]
      20.6
    2. Using strategy rm
      20.6
    3. Applied sin-sum to get
      \[\color{red}{\sin \left(x + \varepsilon\right)} - \sin x \leadsto \color{blue}{\left(\sin x \cdot \cos \varepsilon + \cos x \cdot \sin \varepsilon\right)} - \sin x\]
      15.0
    4. Applied associate--l+ to get
      \[\color{red}{\left(\sin x \cdot \cos \varepsilon + \cos x \cdot \sin \varepsilon\right) - \sin x} \leadsto \color{blue}{\sin x \cdot \cos \varepsilon + \left(\cos x \cdot \sin \varepsilon - \sin x\right)}\]
      15.0
    5. Using strategy rm
      15.0
    6. Applied log1p-expm1-u to get
      \[\sin x \cdot \cos \varepsilon + \left(\color{red}{\cos x \cdot \sin \varepsilon} - \sin x\right) \leadsto \sin x \cdot \cos \varepsilon + \left(\color{blue}{\log_* (1 + (e^{\cos x \cdot \sin \varepsilon} - 1)^*)} - \sin x\right)\]
      15.0
    7. Applied taylor to get
      \[\sin x \cdot \cos \varepsilon + \left(\log_* (1 + (e^{\cos x \cdot \sin \varepsilon} - 1)^*) - \sin x\right) \leadsto \log_* (1 + (e^{\sin \varepsilon \cdot \cos x} - 1)^*)\]
      0.1
    8. Taylor expanded around 0 to get
      \[\color{red}{\log_* (1 + (e^{\sin \varepsilon \cdot \cos x} - 1)^*)} \leadsto \color{blue}{\log_* (1 + (e^{\sin \varepsilon \cdot \cos x} - 1)^*)}\]
      0.1
    9. Applied simplify to get
      \[\log_* (1 + (e^{\sin \varepsilon \cdot \cos x} - 1)^*) \leadsto \cos x \cdot \sin \varepsilon\]
      0.1

    10. Applied final simplification

  1. Removed slow pow expressions

Original test:


(lambda ((x default) (eps default))
  #:name "NMSE example 3.3"
  (- (sin (+ x eps)) (sin x))
  #:target
  (* 2 (* (cos (+ x (/ eps 2))) (sin (/ eps 2)))))